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Y=C+I

C=C°+bY

I=I°

Y=C°+bY+I°

Y-bY=C°+I°

Y(1-b)=C°+I°

Y=(C°+I°)/(1-b)

Y+ΔY = (C°+I°+ΔI;ΔC)/(1-b)

Y+ΔY = (C°+I°)/(1-b) + ΔI;ΔC/(1-b) = Y + ΔI;ΔC/(1-b)

ΔY=ΔI;ΔC/(1-b)

ΔY/ΔI;ΔC=1/(1-b)

ΔY/ΔI=1/(1-b)

ΔY/ΔC=1/(1-b)

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